Balance between stability and variability in bottlenose dolphin signature whistles offers potential for additional information
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Summary
This summary is machine-generated.Bottlenose dolphin signature whistles (SWs) remain stable over 15 years, preserving identity. However, whistle complexity and sex influence variability, suggesting SWs convey additional social information beyond identity.
Area Of Science
- Marine Mammal Bioacoustics
- Animal Communication
- Behavioral Ecology
Background
- Bottlenose dolphins (Tursiops spp.) utilize individually distinctive signature whistles (SWs) for identity signaling.
- Maintaining SW contour stability is crucial for reliable identity recognition.
- Potential for SWs to encode additional information necessitates exploring whistle variability.
Purpose Of The Study
- To assess the long-term stability of bottlenose dolphin signature whistles over a 15-year period.
- To investigate if whistle complexity influences the degree of variability in SWs.
- To explore potential sex-based differences in SW variability.
Main Methods
- Analysis of acoustic recordings from Indo-Pacific bottlenose dolphins (2002 and 2017-2018).
- Assessment of SW contour stability using basic acoustic parameters and visual inspection.
- Quantification of SW variability and complexity using developed metrics.
- Statistical testing to determine the relationship between whistle complexity, sex, and variability.
Main Results
- SW frequency contours demonstrated high long-term stability.
- A significant decrease in minimum frequency (8.8%) was observed over 15 years.
- Individual variability in SWs was evident, with higher variability noted in males compared to females.
- Whistles with greater frequency modulation exhibited increased variability.
Conclusions
- Bottlenose dolphin signature whistles maintain long-term stability for identity function.
- SWs possess inherent variability that may encode contextual information (social/behavioral).
- Observed sex-based differences in variability suggest differential use of SWs in social contexts.
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